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CVE-2021-46905

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Date: February 26, 2024

In the Linux kernel, the following vulnerability has been resolved: net: hso: fix NULL-deref on disconnect regression Commit 8a12f8836145 ("net: hso: fix null-ptr-deref during tty device unregistration") fixed the racy minor allocation reported by syzbot, but introduced an unconditional NULL-pointer dereference on every disconnect instead. Specifically, the serial device table must no longer be accessed after the minor has been released by hso_serial_tty_unregister().

Language: C

Severity Score

Related Resources (12)

https://git.kernel.org/stable/c/90642ee9eb581a13569b1c0bd57e85d962215273
https://git.kernel.org/stable/c/41c44e1f3112d7265dae522c026399b2a42d19ef
https://access.redhat.com/security/cve/CVE-2021-46905
https://git.kernel.org/stable/c/5871761c5f0f20d6e98bf3b6bd7486d857589554
https://git.kernel.org/stable/c/5c17cfe155d21954b4c7e2a78fa771cebcd86725
https://git.kernel.org/stable/c/0c71d4c89559f72cec2592d078681a843bce570e
https://git.kernel.org/stable/c/d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53e
https://git.kernel.org/stable/c/24b699bea7553fc0b98dad9d864befb6005ac7f1
https://git.kernel.org/stable/c/0f000005da31f6947f843ce6b3e3a960540c6e00
https://nvd.nist.gov/vuln/detail/CVE-2021-46905
https://git.kernel.org/stable/c/2ad5692db72874f02b9ad551d26345437ea4f7f3
https://www.mend.io/vulnerability-database/CVE-2021-46905

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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